[CentOS] Problem with widescreen display

Vaclav Mocek little.owl at email.cz
Tue Nov 4 21:55:02 UTC 2008


It is really strange, I would expect problems with FC4. Could you send
your xorg.conf and describe your graphic hardware?



Marko Vojinovic wrote:
> I have a dual boot CentOS 5.2 / FC4 machine, and recently I have bought a new 
> widescreen tft monitor. I used to use a plain 4:3 crt, and after plugging the 
> 16:9 tft naturally X needed reconfiguring. This was easy in FC4, and seemed 
> as easy in CentOS, but with a wrong result.
> Basically, what I did was to run system-config-display to reconfigure for the 
> new monitor and resolution. All goes well, but after X restarts, I see a 
> strange picture: the resolution indeed goes to 1680x1050 as is supposed to, 
> but is squeezed/shrinked/scaled horizontally to match a 4:3 aspect ratio, 
> leaving two (unequal) black bands on the left and right side of the monitor.
> This is specific to 1680x1050 resolution, while lower ones display ok up to 
> the fact that the virtual screen is usually bigger than the displayed part so 
> scrolling is necessarry (and this is annoying, for I cannot see the panel and 
> the top of the window simultaneously).
> The very same hardware and virtually same X configuration work perfectly ok on 
> FC4, which suggests that this is not a hardware problem, nor an X problem. 
> Further, as I see, FC4 has older version of virtually all software than 
> CentOS.
> I have tried various acrobatics with xorg.conf, but nothing helped; read 
> Xorg.0.log inside out and back, compared to FC4, and everything seems 
> essentially identical. X seems to work as everything is ok, so is mplayer 
> (even in fullscreen), but the black bands remain there and the whole desktop 
> is scaled to 4:3. The monitor "autoadjust" button also doesn't help (although 
> it works in general).
> I'm out of ideas where to look for the cause of this. If you wish, I can post 
> xorg.conf and log files from both OSes, but they are mainly identical and I 
> see nothing suspicious.
> Btw, this is on an nVidia GeForce 4 using the default nv driver. The vesa 
> driver doesn't support widescreen resolutions, while nvidia binary driver 
> crashes X completely on start (but this is a known motherboard problem common 
> to FC4 as well).
> Is there some kernel setting or whatever that might "force" the graphics card 
> to 4:3 aspect irrespective of X configuration? Some "filter" between what X 
> tries to display and the actual signal to the monitor? What else can I try?
> Any advice appreciated!
> Best, :-)
> Marko
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